The basic principle of modal analysis was showed;the unique winding structure of the inductive filtering transformer was described; and the reasons of vibration and noise of the inductive filtering transformer were ana⁃lyzed. According to the actual parameters of inductive filtering transformer,the finite element models of winding and core were established;the modal frequencies and corresponding mode shapes of winding and core of inductive filte⁃ring transformer were calculated by finite element analysis software, and the calculated modal frequencies and mode shapes were consistent with the measured results. A comparative analysis is made for the vibration waveforms of in⁃ductive filtering transformer core and traditional converter transformer core by experiments. The results show that the primary frequency of inductive filtering transformer winding is in the range of 2500~4200 Hz, and the most of modal shapes are bendings in the end of winding. The primary frequency of inductive filtering transformer core is in the range of 300~2700 Hz, and the most of modal shapes are bendings in the end of core and the center of yoke. The vibration of inductive filtering transformer is markedly lower than that of the traditional converter transformer.%给出了模态分析的基本原理，介绍了感应滤波变压器独特的绕组结构，分析了引起感应滤波变压器振动和噪声的原因。根据感应滤波变压器的实际参数，建立了它的绕组和铁心的有限元模型；计算了绕组和铁心的模态频率及对应的模态振型，计算所得模态频率和振型与实测结果一致。对感应滤波变压器铁心和传统换流变压器铁心的振动波形进行了实验对比分析。结果表明：感应滤波变压器绕组模态频率主要在2500～4200 Hz范围内，振型集中在绕组的端部弯曲；铁心模态频率主要在300～2700 Hz范围内，振型主要集中为心柱的端部和磁轭中部弯曲；感应滤波变压器的振动明显低于传统换流变压器。
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